Eye anatomy diagram
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The science of vision: How do our eyes see?
The structure of the human eye is so complex that it’s hard to believe that it’s not the product of intelligent design, but by looking at the eyes of other animals, scientists have shown that it evolved very gradually from a simple light-dark sensor over the course of around 100 million years. It functions in a very similar way to a camera, with an opening through which the light enters, a lens for focusing and a light-sensitive membrane at the back.
Trouble seeing the board is usually the most obvious sign a child may need glasses. We all know distant objects are blurry if you’re nearsighted, but have you ever wondered what actually causes it? Here’s a look how our eyes work and what causes three common refractive errors in humans
Sunglasses Guide For Men
How Sunglasses Work | 'Ultraviolet (UV) rays consist of two types of harmful rays: UVA and UVB. Cumulative exposure leads to eye damage. While most sunglasses provide protection from UV rays in sunlight, high-grade sunglasses have layers of coatings to block any lights that might damage the eyes.'